Gemstone



FIG. 1 is a first perspective view of a gemstone showing my new design;

FIG. 2 is a second perspective view thereof, which is rotated 45° about a vertical axis relative to the view of FIG. 1;

FIG. 3 is a left side elevational view thereof, the right, front and back side elevational views being identical thereto;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The portions of FIGS. 1-5 that are depicted with broken lines form no part of the claimed design. 

CLAIM The ornamental design for a gemstone, as shown and described. 